CurtPalme.com Home Theater Forum

Kevin D · Joined: 23 Nov 2007 Posts: 63

So I ruled out the pre-amp/scalar, I ruled out the source, ruled out resolutions, and I ruled out the HDMI to component converter.

Symptoms started with what appears to be the vertical size not being stable. Hard to notice without the video paused or on the guide, but the picture will get bigger/smaller vertically by a small amount. Comes and goes, when it's doing it it almost seems like a heartbeat, but no consistent timing.

It just started throwing in horizontal lines that flicker across right before it's about to change sizes. Not as common as the size change, but getting worse.

It only does this after the TV warms up for about an hour and seems to get worse as the night goes on.

Any thoughts on where to start?

Kevin D.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

My first thoughts would be a bad solder joint. I would check and resolder the vertical section, the horz and HV section and the power supply section..... Smile

Oh, and lets not forget the convergence section.... Laughing

Kevin D · Joined: 23 Nov 2007 Posts: 63

Whew... Thought it was going to be a tough fix. Wink

Might be easier to install a window unit in the thing.

In all honesty, hitting each solder joint in the thing almost sounds like a morbidly good time. What's the best wattage to do that with?

Kevin D.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

You really dont have to solder every joint in these sections, just the ones that look funny. Use a magnifier of some sort though.

The iron size is not super critical. The key is to just not hold it on for very long. This is where some finesse come in. If a joint has a heavy gnd strip or a coil then it takes more heat to get good flow. A larger iron is better for this, (40 watt). Even though its a hotter iron the solder will flow quicker so less time on the joint. You could still use this iron on smaller stuff but be real quick, but not to quick that you dont get a good flow and bond. 2 irons or an adjustable range are better. Non adjustable irons are cheap.

Kevin D · Joined: 23 Nov 2007 Posts: 63

So here's an interesting turn of events. Can dust cause a problem, or is the front cover half off enough to keep it cooler?

After being on all day Sunday, it was messing up bad. I pulled the front cover off half way and put a cheap 18" fan in front of the open half. TV quit messing up rather quickly.

Come home tonight and decide to leave the fan off and only turn it on when the TV starts messing up. TV hasn't had an issue all night. I guess I'll throw the front cover back on tomorrow night and see if it starts up again.

Kevin D.